Electrochemical extraction of methanol from lignin under mild conditions

Hibino, Takashi; Kobayashi, Kazuyo; Zhou, Dongwen; Chen, Siyuan; Zinchenko, Anatoly; Teranishi, Shinya; Miyawaki, Aki; Sawada, Yoshiharu

doi:10.1016/j.apcatb.2023.123328

“…Electrochemical ODM under ambient pressure at 75 °C of sodium lignosulfonate (with 8.7 wt % Ar−OMe) in 85 % aqueous H 3 PO 4 was reported to produce CH 3 OH with 41.5 % yield and 95 % faradaic efficiency [154] …”

Section: Odm Of Ortho‐methoxyphenolsmentioning

confidence: 99%

“…[153] Electrochemical ODM under ambient pressure at 75 °C of sodium lignosulfonate (with 8.7 wt % ArÀ OMe) in 85 % aqueous H 3 PO 4 was reported to produce CH 3 OH with 41.5 % yield and 95 % faradaic efficiency. [154] Despite the intense research on ODM of technical lignins in recent years, comparison between the different studies is elusive due to the large variety in technical lignins and the reaction conditions. But even with similar lignin substrates and conditions, comparison is difficult due to the variety of analysis techniques, viz.…”

Section: Odm Of Technical Ligninmentioning

confidence: 99%

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

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Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Wu,

Smet,

Brandi

et al. 2024

Angewandte Chemie

1

0

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Lignin represents the largest aromatic carbon resource in plants, holding significant promise as a renewable feedstock for bioaromatics and other cyclic hydrocarbons in the context of the circular bioeconomy. However, the methoxy groups of aryl methyl ethers, abundantly found in technical lignins and lignin‐derived chemicals, limit their pertinent chemical reactivity and broader applicability. Unlocking the phenolic hydroxyl functionality through O‐demethylation (ODM) has emerged as a valuable approach to mitigate this need and enables further applications. In this review, we provide a comprehensive summary of the progress in the valorization of technical lignin and lignin‐derived chemicals via ODM, both catalytic and non‐catalytic reactions. Furthermore, a detailed analysis of the properties and potential applications of the O‐demethylated products is presented, accompanied by a systematic overview of available ODM reactions. This review primarily focuses on enhancing the phenolic hydroxyl content in lignin‐derived species through ODM, showcasing its potential in the catalytic funneling of lignin and value‐added applications. A comprehensive synopsis and future outlook are included in the concluding section of this review.

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Electro‐Oxidative Extraction of Methanol from Lignin Using a Three‐Dimensional Graphite Anode

Xiong,

Kobayashi,

Miyawaki

et al. 2024

ChemElectroChem

0

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This paper reports an electrochemical approach that uses lignin as a resource for renewable and sustainable methanol production. The aromatic rings of lignin have methoxy substituents, which can be oxidatively demethylated to methanol by active oxygen produced at the anode. A graphite electrode fabricated in a sponge form provided sufficient reaction space for the lignin feedstock, efficiently generated active oxygen species from water, and considerably suppressed the overoxidation of methanol to carbon dioxide. As a result, the methanol yield reached approximately 70 % at a temperature of 75 °C, atmospheric pressure, and anode potential of +0.57 V. Another advantage of this technique is that hydrogen evolution reaction (HER) occurred at the cathode and the cathode potential was held at approximately −0.5 V during the HER. Therefore, the cell voltage required for lignin electrolysis was 1.1 V or lower, which means that hydrogen as well as methanol was produced under mild conditions.

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Electrochemical extraction of methanol from lignin under mild conditions

Cited by 5 publications

References 68 publications

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Advancements and Perspectives toward Lignin Valorization via O‐Demethylation

Electro‐Oxidative Extraction of Methanol from Lignin Using a Three‐Dimensional Graphite Anode

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